/* =============================================================
   Gas Bottle Finder — Front-end CSS
   APS Garden Machinery blue theme (#0066C0)
   All classes scoped to .gbf-* — no global pollution
   ============================================================= */

.gbf-wrap *,
.gbf-wrap *::before,
.gbf-wrap *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.gbf-wrap {
  --gbf-blue:        #0066C0;
  --gbf-blue-dark:   #004d99;
  --gbf-blue-deeper: #003d7a;
  --gbf-blue-light:  #e6f0fa;
  --gbf-blue-mid:    #cce0f5;
  --gbf-text:        #111827;
  --gbf-muted:       #6b7280;
  --gbf-border:      #e5e7eb;
  --gbf-surface:     #ffffff;
  --gbf-bg:          #f8fafc;
  --gbf-radius:      12px;
  --gbf-radius-sm:   8px;
  --gbf-shadow:      0 1px 12px rgba(0, 102, 192, 0.08);
  --gbf-shadow-lg:   0 8px 32px rgba(0, 102, 192, 0.14);

  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--gbf-text);
  max-width: 880px;
  margin: 0 auto;
  padding: 36px 16px 56px;
}

/* ---- Intro accent bar ------------------------------------- */
.gbf-wrap::before {
  content: '';
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--gbf-blue) 0%, #3399ff 100%);
  border-radius: 4px;
  margin-bottom: 36px;
}

/* ---- Utility ---------------------------------------------- */
.gbf-hidden { display: none !important; }

/* ---- Screens ---------------------------------------------- */
.gbf-screen { display: none; }
.gbf-screen.gbf-active {
  display: block;
  animation: gbf-fade-up 0.28s ease both;
}

@keyframes gbf-fade-up {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---- Intro screen ------------------------------------------ */
#gbf-intro-screen {
  text-align: center;
}

.gbf-intro-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--gbf-blue-light);
  color: var(--gbf-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.gbf-intro-subtitle {
  text-align: center;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gbf-blue);
  margin-bottom: 8px;
}

.gbf-intro-title {
  text-align: center;
  font-size: clamp(24px, 5vw, 32px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--gbf-text);
  margin-bottom: 16px;
}

.gbf-intro-body {
  text-align: center;
  font-size: 16px;
  line-height: 1.6;
  color: var(--gbf-muted);
  max-width: 480px;
  margin: 0 auto 32px;
}

.gbf-intro-start-btn {
  padding: 14px 32px;
  font-size: 16px;
}

/* ---- Question screen -------------------------------------- */
.gbf-q-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  min-height: 34px;
}

.gbf-step-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gbf-muted);
  background: var(--gbf-bg);
  border: 1px solid var(--gbf-border);
  padding: 3px 10px;
  border-radius: 999px;
}

.gbf-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--gbf-muted);
  padding: 6px 10px 6px 4px;
  border-radius: var(--gbf-radius-sm);
  transition: color 0.15s, background 0.15s;
}
.gbf-back-btn:hover {
  color: var(--gbf-blue);
  background: var(--gbf-blue-light);
}

.gbf-question {
  font-size: clamp(20px, 4vw, 28px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--gbf-text);
  margin-bottom: 28px;
}

/* ---- Options ---------------------------------------------- */
.gbf-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.gbf-option-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.gbf-option-btn {
  flex: 1;
  text-align: left;
  background: var(--gbf-surface);
  border: 2px solid var(--gbf-border);
  border-radius: var(--gbf-radius);
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 600;
  color: var(--gbf-text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s, transform 0.1s;
  box-shadow: var(--gbf-shadow);
  position: relative;
}

.gbf-option-btn::after {
  content: '›';
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  color: var(--gbf-border);
  transition: color 0.15s, right 0.15s;
}

.gbf-option-btn:hover {
  border-color: var(--gbf-blue);
  background: var(--gbf-blue-light);
  color: var(--gbf-blue-dark);
  box-shadow: 0 4px 20px rgba(0, 102, 192, 0.15);
  transform: translateX(2px);
}

.gbf-option-btn:hover::after {
  color: var(--gbf-blue);
  right: 16px;
}

.gbf-option-btn:active { transform: translateX(0); }

.gbf-info-btn {
  flex-shrink: 0;
  width: 44px;
  border-radius: var(--gbf-radius-sm);
  border: 2px solid var(--gbf-border);
  background: var(--gbf-surface);
  color: var(--gbf-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
  box-shadow: var(--gbf-shadow);
}
.gbf-info-btn:hover {
  color: var(--gbf-blue);
  background: var(--gbf-blue-light);
  border-color: var(--gbf-blue);
}

/* ---- Results header --------------------------------------- */
.gbf-results-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  background: var(--gbf-surface);
  border: 1px solid var(--gbf-border);
  border-top: 3px solid var(--gbf-blue);
  border-radius: var(--gbf-radius);
  padding: 20px 24px;
  margin-bottom: 28px;
  box-shadow: var(--gbf-shadow);
}

.gbf-results-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--gbf-text);
  margin-bottom: 4px;
}

.gbf-results-sub {
  font-size: 14px;
  color: var(--gbf-muted);
}

.gbf-results-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

/* ---- Product carousel -------------------------------------- */
.gbf-carousel {
  position: relative;
}

.gbf-grid {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-behavior: smooth;
  scroll-snap-type: x proximity;
  padding-bottom: 6px; /* room for card hover shadow */
  scrollbar-width: none;     /* Firefox */
  -ms-overflow-style: none;  /* old Edge/IE */
}

.gbf-grid::-webkit-scrollbar {
  display: none; /* Chrome/Safari/new Edge */
}

.gbf-carousel-arrow {
  position: absolute;
  top: 40%;
  transform: translateY(-50%);
  z-index: 5;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--gbf-surface);
  border: 1px solid var(--gbf-border);
  box-shadow: var(--gbf-shadow-lg);
  color: var(--gbf-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
}

.gbf-carousel-arrow:hover {
  background: var(--gbf-blue-light);
  border-color: var(--gbf-blue-mid);
}

.gbf-carousel-arrow:disabled,
.gbf-carousel-arrow.gbf-hidden {
  display: none;
}

.gbf-carousel-arrow-prev { left: -6px; }
.gbf-carousel-arrow-next { right: -6px; }

/* ---- Product card ----------------------------------------- */
.gbf-card {
  flex: 0 0 230px;
  width: 230px;
  scroll-snap-align: start;
  background: var(--gbf-surface);
  border: 1px solid var(--gbf-border);
  border-radius: var(--gbf-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--gbf-shadow);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
  animation: gbf-card-in 0.35s ease both;
}

.gbf-card:hover {
  border-color: var(--gbf-blue-mid);
  box-shadow: var(--gbf-shadow-lg);
  transform: translateY(-3px);
}

@keyframes gbf-card-in {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.gbf-card-img-wrap {
  aspect-ratio: 1;
  background: var(--gbf-bg);
  overflow: hidden;
}

.gbf-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.gbf-card:hover .gbf-card-img { transform: scale(1.05); }

.gbf-card-body {
  padding: 16px 18px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.gbf-card-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--gbf-text);
  line-height: 1.3;
}

.gbf-card-sku {
  font-size: 12px;
  color: var(--gbf-muted);
}

.gbf-card-price {
  font-size: 17px;
  font-weight: 800;
  color: var(--gbf-blue);
  margin-top: 4px;
}

/* wc_price() wraps in <span> elements — inherit colour from parent */
.gbf-card-price .woocommerce-Price-amount,
.gbf-card-price .woocommerce-Price-currencySymbol,
.gbf-card-price bdi {
  color: inherit;
  font-size: inherit;
  font-weight: inherit;
}

.gbf-card-foot {
  padding: 0 18px 18px;
}

/* ---- Buttons ---------------------------------------------- */
.gbf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: var(--gbf-radius-sm);
  border: 1.5px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
  white-space: nowrap;
  line-height: 1;
}

.gbf-btn-primary {
  background: var(--gbf-blue);
  color: #fff;
  border-color: var(--gbf-blue);
}
.gbf-btn-primary:hover {
  background: var(--gbf-blue-dark);
  border-color: var(--gbf-blue-dark);
  color: #fff;
  box-shadow: 0 4px 14px rgba(0, 102, 192, 0.35);
}

.gbf-btn-outline {
  background: transparent;
  color: var(--gbf-text);
  border-color: var(--gbf-border);
}
.gbf-btn-outline:hover {
  background: var(--gbf-bg);
  border-color: #c5ccd6;
  color: var(--gbf-text);
}

.gbf-card-cta {
  width: 100%;
  padding: 11px 16px;
}

/* ---- No results ------------------------------------------- */
.gbf-no-results {
  text-align: center;
  padding: 64px 24px;
  background: var(--gbf-bg);
  border: 2px dashed var(--gbf-border);
  border-radius: var(--gbf-radius);
  color: var(--gbf-muted);
}
.gbf-no-results svg { margin-bottom: 16px; opacity: 0.4; }
.gbf-no-results p { margin-bottom: 6px; }
.gbf-no-results-hint { font-size: 13px; }

/* ---- Modal ------------------------------------------------ */
.gbf-modal {
  position: fixed;
  inset: 0;
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.gbf-modal[hidden] { display: none; }

.gbf-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(3px);
}

.gbf-modal-box {
  position: relative;
  background: var(--gbf-surface);
  border-radius: var(--gbf-radius);
  border-top: 3px solid var(--gbf-blue);
  padding: 32px 28px 28px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  animation: gbf-modal-in 0.2s ease both;
}

@keyframes gbf-modal-in {
  from { opacity: 0; transform: scale(0.94); }
  to   { opacity: 1; transform: scale(1); }
}

.gbf-modal-close {
  position: absolute;
  top: 10px;
  right: 12px;
  background: none;
  border: none;
  font-size: 26px;
  color: var(--gbf-muted);
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
  line-height: 1;
  transition: color 0.15s, background 0.15s;
}
.gbf-modal-close:hover {
  color: var(--gbf-text);
  background: var(--gbf-bg);
}

.gbf-modal-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--gbf-blue-dark);
  margin-bottom: 12px;
  padding-right: 28px;
}

.gbf-modal-body {
  font-size: 15px;
  color: var(--gbf-muted);
  line-height: 1.65;
}

/* ---- Responsive ------------------------------------------- */
@media (max-width: 540px) {
  .gbf-wrap { padding: 24px 12px 40px; }

  .gbf-results-header { flex-direction: column; }
  .gbf-results-actions { width: 100%; }
  .gbf-results-actions .gbf-btn { flex: 1; justify-content: center; }

  .gbf-card { flex: 0 0 200px; width: 200px; }
  .gbf-carousel-arrow { width: 34px; height: 34px; }
}

@media (max-width: 380px) {
  .gbf-card { flex: 0 0 178px; width: 178px; }
}